A $15-million upgrade to a sports facility in Sydney's west could help the city secure a second AFL team, New South Wales Premier Bob Carr said today.

The upgrade of Blacktown Olympic Park would also allow for regular Pura Cup and one-day cricket matches, he said.

"These will be fantastic community sporting facilities that could also provide first class training grounds for a second AFL team in Sydney, should the AFL decide to add to the league in the future," Mr Carr said.

The upgrade included the development of a main stadium for 10,000 spectators, a second training oval, and an indoor practice hall which would complement existing softball and baseball facilities.

AFL NSW chief executive Dale Holmes said the code had plans for a game to be played in Sydney every week by 2015.

The Sydney Swans, the city's sole AFL team, now played a game away from the team's home ground every second week.

Mr Holmes said the upgraded Blacktown stadium would be first class, and would create the right environment for a second side.

"Aspirationally we'd love, at some stage in the future, to provide the people of NSW with a game every week," he said.

"So ultimately we'd love to see the situation where the market conditions were so good that we could get a second side."

Construction will begin at Blacktown at the end of next year, with the upgrade due for completion in 2008.